package com.rzl.expense.web.controller.common;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Base64;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import com.rzl.expense.common.config.ExpenseConfig;
import com.rzl.expense.common.constant.Constants;
import com.rzl.expense.common.core.domain.AjaxResult;
import com.rzl.expense.common.utils.StringUtils;
import com.rzl.expense.common.utils.file.FileUploadUtils;
import com.rzl.expense.common.utils.file.FileUtils;
import com.rzl.expense.framework.config.ServerConfig;
import springfox.documentation.spring.web.json.Json;

/**
 * 通用请求处理
 *
 * @author expense
 */
@RestController
@RequestMapping("/common")
public class CommonController {
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    private static final String FILE_DELIMETER = ",";

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete   是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request) {
        try {
            if (!FileUtils.checkAllowDownload(fileName)) {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = ExpenseConfig.getUploadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete) {
                FileUtils.deleteFile(filePath);
            }
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception {
        try {
            // 上传文件路径
            String filePath = ExpenseConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        } catch (Exception e) {
            e.printStackTrace();
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception {
        try {
            // 上传文件路径
            String filePath = ExpenseConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files) {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        try {
            if (!FileUtils.checkAllowDownload(resource)) {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = ExpenseConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

    @PostMapping("/base64/upload")
    public AjaxResult uploadBase64(MultipartFile file) throws Exception {
        AjaxResult ajax = AjaxResult.success();
        try {

            // 上传文件路径
            String filePath = ExpenseConfig.getUploadPath();
            // 上传并返回新文件名称
            String path = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + path;
            String fileName = FileUtils.getName(path);

            String resultNum = getReadingNum(new File(filePath + fileName));
            JSONObject obj = JSON.parseObject(resultNum);
            if (obj.getIntValue("code", 5001) == 1000) {
                ajax.put("url", url);
                ajax.put("path", path);
                ajax.put("fileName", fileName);
                ajax.put("read", obj.get("read"));
            } else {
                ajax.put("msg", obj.getString("msg"));
                ajax.put("code", obj.getIntValue("code"));
                FileUploadUtils.deleteFile(filePath + fileName);
            }

        } catch (Exception e) {
            e.printStackTrace();
            return AjaxResult.error(e.getMessage());
        }
        return ajax;
    }

    public String getReadingNum(File file) {
        try {

            // 读取图片文件并进行 Base64 编码
            FileInputStream fis = new FileInputStream(file);
            byte[] bytes = new byte[(int) file.length()];
            fis.read(bytes);
            fis.close();
            String base64Encode = Base64.getEncoder().encodeToString(bytes);

            // URL 编码数据
            String data = "image=" + URLEncoder.encode(base64Encode, StandardCharsets.UTF_8.toString());

            // 设置请求
            URL url = new URL("http://36.155.105.97/meter-read");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("Content-Length", String.valueOf(data.length()));

            // 发送数据
            try (OutputStream os = conn.getOutputStream()) {
                os.write(data.getBytes(StandardCharsets.UTF_8));
            }

            // 读取响应
            StringBuilder response = new StringBuilder();
            try (BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8))) {
                String line;
                while ((line = br.readLine()) != null) {
                    response.append(line);
                }
            }

            // 打印响应
            return response.toString();

        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }
}
